Air-pump for inflating automobile-tires.



J. DESMOND.

AIR PUMP FOR INFLATING AUTOMOBILE TIRES.

APPLICATION FILED JAN. 20,1909.

Patented J an. 21, 1913.

2 SHEETS-SHEBT 1.

I J. DESMOND AIR PUMP FOR INFLATING AUTOMOBILE TIRES.

APPLICATION FILED JAN. 20, 1909.

UNITED STATES PATENT GFEIQE.

7 JOHN nnsmonn, or cmcaco, rnmn'oxs',

ASSIGNOE, BY MESNE ASSIGNMENTS, TO-

. WILLIAM S. POTWIN, 0F CHICAGO, ILLINOIS.

AIR-PUMP FOB INFLATING AUTOMOBILE-TIRES.

Specification of. Letters Patent.

Patented Jan. 21, 1913.

Application filed January 20, 1809. Serial 30. 473,323.

To all whom it may concern I- -connectedto the engines of automobiles such asare now in common use and driy *1 thereby to inflate the tires of the machine.

With this and other'objects in view, the invention consists in the features of construction, combinations and arrangements of parts hereinafter set forth, illustrated in the accompanying drawings and more particularly pointed out in the appended'claims;

In the drawin Figure 1 is a lan View of the front portion of the frame 0 an auto mobile showingthe improved air pump ap" plied in position thereon; Fig. 2 is a partial front view of the same; Fi 3 is a detail section on the line 3-3 of 1g. 1;.Fig. 4.- is a detail section on the line 4-4 of-Fig.1.;- Fig. 5 is a ,view in central longitudinal sec-- t-ion of the improved umpyFig 6 is a view in elevation thereo with the crank case cover removed.

The automobile frame illustrated is of common type and comprises-outer and inner:

side-bars '10 andll connected by a cross; bar 12. Springs 13 are' pivotally connected at their front and rear ends b suitable cou: plings 14 to the. outer side-liars 10. The front axle 15 that carries the wheels 16 is secured to the'springs 13 by cou lings 17. As usual in the common type 0 automobiles driven by internal combustion engines, the engine or motor is mounted upon the forward part of the frame with its crank or engine shaft extending longitudinally thereo -In the form illustrated,- the engine 18 is mounted between a pair of supports 19 that'rest upon and are secured to the inner side-bars 11. The rear end of the engine shaft is connected to. the rear drive axle of the machine while its forward .end is proof a coupling piece orshaft 22- that is journaled in a bracket 23 depending from the front cross-bar 12 of the machine. At its inner end, it is provided with an enlarged, hollow head 24 which its over the forward end of the engine shaft 20. The head-or coupling member- 24 is provided with notches 25 that are arranged to engage the end of a cross-pin 26 extending through the shaft. The starting crank 21 is normally disconnected from the engine with the coupling member 24: out of engagement with the pin 26. The parts are held in this disconnected or disengaged position by a sprin 27 coiled about the part 22 and interpose between the bracket 23 and the hub of the crank 21. The end of the crank is provided with a suitable handle 28 and, in starting the engine, the crank and parts connected thereto are first pressed inwardly against the ressure of the spring 27 to bring the notches 25 9f the coupling member into engagement'with the pin 26; the crank is then turned to start the engine. When released, the spring 27 automatically restores the starting crank to its disengaged or disconnected position.

The improved pump is adapted to .be connected to the forward end of the engine shaft and, for this purpose, the engine shaft is provided with an extension projecting through the part 22 of the starting device. This extension is preferably in the form of a short shaft section 29 that may be readily applied to automobiles. now in use by forming a hole through the shaft 22 of the starting'device and in the outer end of the en gine shaft in which the extension 29 is inserted. The 'shaft section 29 is secured in posit-ion and permanently united to the engine shaft 20-by a cross-pin 29 extending through the latter. The forward end of the shaft extension projects beyond the hub of I the starting crank 21 and is adapted to detachably engage the drive shaft of, the irn-- 33. For convenience in -Q removing this cover-plate, it is provided with a rib 345. The opposite side of the crank casing is provided with an integral, cylindrical projection 35 within which the crank shaft 36 of the pump is journaled. In the form illustrated, the cylindrical projection 35 is provided at its inner and outer ends with seats 37, which receive a pair of retainer rings 38 within which are arranged rows of anti-friction balls 39. A cone 40 tachably interlock with the projecting end of the engine shaft extension 29 and for this purpose is preferably adapted to fit over the end of the shaft extension 29 and is pro vided with longitudinally extending slots adapted to receive the ends of a cross-pin 46 upon the end of the shaft extension 29.

' The inner end of the crank-shaft 36 is provided with a crank 47 having a Wrist or crank pin 48 that is engaged by a head 49 screw threaded upon the outer end of a pitman rod 50. A look nut 51 threaded upon the end of the pitman rod engages the inner end of the head 49' as shown. The inner end of the pitman rod is screw threaded into a sphere or ball 52 that engages a conical receive a spanner wrench.

seat 53 in the back of a piston 54. An annular retainer 55 threaded into a socket 56 in the piston engages the ball 51 and thereby connects the pitman rod to the piston. The annular retainer or nut 55 is provided with notches 57 in its outer edge as indicated, to

The head or cap 31 is provided on its outer face with a central enlargement or boss 58 and with lateral projecting bosses 59, all of which are cored out to form a discharge passage 60 that communicates with the interior of the pump cylinder 30 through a discharge port 61. A cup-shaped valve 62 is guided within the central bore of the boss 58 and is arranged to engage a valve seat 63 about the discharge port-61. The valve 62 is yieldingly held to its seat by a spring 64 arranged within the same and bearing at its outer end upon a thimble 65 that is screw threaded to the outer. reduced end of the central boss or projection ,58. A nipple 66 screw threaded .into one of the lateral en'- largements 59 is connected to the end of a coupling pipe 67 by which the pump is connected to the nipple of any of the tires of theautomobile.

In the preferred form illustrated, a relief upon the cap 7 6 in the outer end of a sleeve 77 that valve is mounted upon the other lateral en.- largement 59. The relief valve casing comprises a. cylindrical section 68 which is threaded upon an elbow section 69. The latter is provided with a nipple 70 screw threaded into the lateral enlargement 59 31' of the pump cylinder and this nipple s provided with a reduced relief port or passage 71 communicating with the ischarge passage 60 0f the pump. The 5 relief valve 72 is arranged upon a suitable seat in the casing section 69 and isyield ingly held to its seat by a valve stem 73 and spring 74. The 'valve stem is provided at. its inner end-with a conical head which ongages the valve 7 2 as shown. The outer end of the valve stem extends through a gaggle 1s justably threaded upon the cylindri dal section 68 of the valve casing. Thespring 74; iscoiled about the stem 73 and extends be-, tween the head thereof and the sleeve '77.; i By adjusting the latter, the tension of the spring may be adjusted so that the air com-- pressed by the pump will escape there! through when, thefdesired pressure is attained inithe tire. A spring-catch 78' is ar ranged to engage any one of a series of holes 79 in the sleeve 77 and hold it'in adjusted position. The spring-catch. is secured, as shown, to the valve casing section 69. The relief valve may be thrown out of operation by a thimble 80 screw threaded upon the outer end of the guide 76. By screwing the thimble down'upon the guide 76 againstthe end of the valve-stem 73, the relief valve 72 may be held to its seat. It is frequently desirable to do this if the passages to. the tire are choked up in any way, since otherwise the relief valve would be hfted from its seat to permitthe escape of air before the desired pressure of the tire is attained. When this is done the tire should first. be pum ed up and then the relief valve released by 1111- screwing the thimble 80 so that the air in excess of the tire can escape through the coupling pipe 67, discharge passage 60 and re-- lief valve 72. As shown, the end of theadjusting sleeve 77 is provided with discharge ports 81 to permit the escapeinent of air.

The pump piston 54 in its preferred form j is longer than its stroke and is provided with suitable packing rings 82 as shown. The cylinder 31 is provided in the side wall intermediate its ends with a reduced portion 83 that is provided with a circular series of inlet ports 84. These ports are uncovered by the piston 54 at the end of its out stroke as shown, and the air will rush throu h the ports into the vacuum created upon t e out stroke of the piston. On the in stroke of the piston, the air in the cylinder is compressed past the discharge valve 62 and through the discharge passage 60 and coupllng pipe 67 into the tire. It will be seen, that by means nesnoeo of the dctachably interlocking cou ling members upon the projectin ends 0 the pump shaft 36 and engine aft extension 9, t e pump can be easil and readily connected to the engine of t e automobile and driven thereby to inflatethe tires.

If desired, the pump may be provided with a. handle 85 that is detachably threaded to a socket in the thimble 6b, as shown in Figs. 5 and 6. By means of this handle the pump is conveniently held in position upon the engine shaft to be driven thereby. Preferably, however, a rod 86, as shown in Figs. 1, 2 and 4, is screw threaded into the socket in the thimble 65 and this rod is arranged to detachably engage an opening in a supp0rting bracket or plate 87 that is secured in pasition upon the automobile frame. In the form shown, this support is secured to one of the front side springs 13 by a U-bolt 88. By this means, the pump can be readily supported in position by first inserting the rod 86 through the hole in the supporting plate 87 and then engaging the interlocking coupling members on the shafts 29 and 36. The coupling pipe 67 can then be connected to the tires of the machine, one after another, and the tires umped up. As soon as the work is done t e pump can be readily disengaged from the machine.

It should be noted that the pump in no Way interferes with the proper operation of the engine or its starting crank and can be readily and conveniently applied to automobiles now in use.

It is obvious that numerous changes may be made from the details set forth without departure from the essentials of the invention.

I claim as my invention 1. The combination with an automobile and engine therefor, of a starting crank for the engine, a shaft permanently connected to the engine and projecting through the hub of said starting crank and an air pump adapted to detachably engage the projecting end of said shaft, substantially as described.

2. The COHlblIlHlllOl'l with an automobile and an engine therefor, of a starting crank, a coupling sleeve normally disconnected from the engine \vhcrcon said crank is mounted, a shaft permanently connected to the engine, extending through said coupling sleeve and projecting therefrom, and an air pump having a crank shaft adapted to be detachably coupled to the projecting end of said first mentioned shaft, substantially as described.

3. The combination with an automobile, engine therefor, and engine shaft, of starting device, a coupling sleeve therefor normally disconnected from said engine shaft, said shaft having an extension extending through and projecting from said coupling sleeve, and an air pump comprising a cylinder, a crank shaft iournaled in bearings connected to said cylinder, and a piston in said cylinder connected to said crank shaft said crank shaft and the projecting end of said engine shaft extension having detachably interlocking coupling members, substantially as described.

l. The combination with an automobile, an engine therefor and engine shaft, of a starting crank, a coupling sleeve journaled in the frame of the automobile and normally disconnected from said engine shaft, said shaft having an extension fixed thereto and projecting through said coupling sleeve, and an air pump comprising a crank casing and cylinder, a crank shaft j ournaled in said casing and projecting therefrom, and a piston in said cylinder connected to said crank shaft, the projecting ends of said crank shaft and of -said engine Shaft extension having detachably interlocking coupling members, substantially as described.

5. The combination with an automobile, an engine therefor and a shaft driven by the engine, of a detachable pump casing having acylinder at one end, a piston in said cylinder, an operating crank shaft journaled in the opposite end of said casing and connected to said piston, said pump shaft and said engine shaft having projecting end portions provided with detachably interlocking coupling parts and a support fixed to a part of the at tomobile and having an opening therein, said pump having a projectin part at its cylinder end arranged to loosely extend within the opening of said support when said coupling parts are engaged, whereby the pump is removably held in operative position by said coupling parts and said support, substantially as described.

JOHN DESMOND. I

Witnesses: I

CLARA A. NORTON, KATHARINE GERLACH. 

